I suppose you are going to keep the processor?
If so, you need to get a motherboard that supports Socket 478 processors.
A list of motherboards that support Socket 478:
http://www.motherboards.org/ranking/motherboards/IntelNew/Google the motherboard brand name + model number to read reviews and see if it supports AGP. Most motherboards don't have AGP slots now. IDE slots are still available.
Me go watch TV... come back later